The RAF already has 500 personnel working on space operations, many at RAF Fylingdales.
The base has spent decades looking for threats from space.
Air Command at High Wycombe has now assumed responsibility for command and control of all UK military space operations.
Around 100 more people will join the team over the next five years.
Responding to the £92 million of funding into the UK space sector, Gavin Williamson said:
"The danger space poses as a new front for warfare is one of my personal priorities, and it is absolutely right that we waste no time in going it alone if we need an independent satellite system to combat those emerging threats.
“This alternative system and the UK’s very first Defence Space Strategy which I will launch later this year will be a further boost to military skills, our innovative businesses and our genuinely world-leading role which has seen us make such a key contribution to Galileo.”
Dr Graham Turnock, CEO of UK Space Agency said:
“We remain confident in the strength of our space sector and look forward to working in partnership with them on the exciting prospect of a national satellite navigation system.”